Shear polehead



w. H, EALY 2,142,309 SHEAR POLEHEAD Jan. 3, 193 9.

Filed March 15, 1957 y INVENTOR.

ATTORNEY.

Patented Jan. 3, 1939 2,142,309.

SHEAR POLEHEAD William H. Ealy, Wichita Falls, Tex., assignor to Clark Machine Company, Wichita Falls, Tex.

Application March 13, 1937, Serial No. 130,745

3 Claims. 254-139) This invention relates to well spudding and drilling machines and it has particular reference to an improved shear pole head.

The principal object of the invention is to proby means of bolts H to the plates the ends of the shaft 6.

The crown member is constructed with an arcuate bridge l2, reinforced by webs I3 and exl to embrace 5 vide for the incorporation in the head of a shear tends upwardly and outwardly at a slight angle 5 pole, the casing sheaves, drilling sheave and sand with respect to the plane of the bearing plates 4 line sheave in a single sturdy and compact unit and It. The castings 9, defining the bridge l2, and to so dispose the sheaves relative to the casare each provided with bearings M in which are ing hole that the casing blocks will be at all times journaled the ends of a stub shaft l5. The shaft in perfect alignment with the hole. In this mancarries a single sand sheave I 6. 10 ner, the invention is effective in eliminating the Referring again to the shear pole castings 2, it necessity of changing the position of the shear will be noted in Figure 1 that each has an angular poles when running casing. plate I! on one side, reinforced by a web l8 there- Another object of the invention is to provide under. These plates are provided with semi-cy- 15 complementary castings, designed for association lindrical, ribbed grooves l9 to receive the ends of 16 to uniformly distribute the strain normally ima shaft 20, which latter carries the large drilling posed on the sheaves in operation. sheave 2|. Angularly disposed plates Zla are With the foregoing objects as paramount, the mounted at one end on the shaft 6 and engage invention has particular reference to its salient the lower shaft 20 to afford a means to maintain 20 features of construction and arrangement of the sheave 2| in a central position on the latte 20 parts which Will become manifest as the descripshaft. 1 tion proceeds, taken in connection with the ac- It will be observed that the peculiar construccompanying drawing, wherein: tion and relationship of the elements of the shear Figure 1 is a side elevation of a shear pole head pole head is such that the axes of the shafts 6,

constructed according to the present invention. [5 and 20 are relatively offset, thereby avoiding 25 Figure 2 is a front elevation. interference between the lines and the arrange- Figure 3 is a detail View in perspective of one ment is especially useful in that the casing blocks of the shear pole castings, and are always in perfect alignment with the casing Figure 4 is a perspective ew Of anothe f m hole, which eliminates the necessity of changing of sheave mounting. the positions of the poles I when running casing. 30

Continuing with a more detailed description of In the form of the invention shown in Figure 4, the drawing, portions of the shear poles I are the collars 22, comparable to collars 3 in the shown in Figures 1 and 2 and comprise the mast preceding figures, are provided with an apron or derrick of a portable spudding machine. The 23 as an added reinforcement, since the weight shear poles are constructed preferably of tubular is forward of the longitudinal axes of the shear 35 material since such construction usually obviates poles 24, on which the head is mounted. much of the bracing Otherwise neqessary The differentiating characteristics of the form Mounted on each of the Poles I 15 a castmg shown in Figure 4, over the previously described These castin s a each comprised of n integral shear pole head, lies in the fact that the shaft 25,

40 collar 3 to receive the end of the pole, with a flat carrying the drilling sheave 26, shown fragmem 40 befirmg plat? 4 f p The plate movided tarily, is journaled in apertures in plates 21, cast Wlth a 5 f regelve if integrally with the collars 22 while in the. precedsha'ft g i i g 232;; fig g igzf ing instance, the ends of the comparable shaft ggggii wee e g p V y lie in grooves and are held operatively therein by 45 In spaced relationship near the ends of the bearmg f l shaft 6 is provided annular grooves which correrentmmmg Structure the head shown m spond with the annularly disposed ribs 8 within figure the upper ca stmg shaft 29 and the groove 5 in the bearing plate The shaft is 1ts sheaves 30 are substantially the same, as well thus held against longitudinal displacement in as the centermg plates comparable to plates 50 2m in in Figure 2.

Manifestly, the construction as shown and described is capable of some modification and such modification as may be construed within the scope and meaning of the appended claims is also considered to be within the spirit and intent of the invention.

What is claimed is:

1. A shear pole head comprising companion collar members receiving the ends of shear poles and; having grooved bearing plates, a pair of arcuate members having bearing plates complementary to the plates of said collar members and disposed on the latter to embrace a shaft disposed in the grooves of said plates, said arcuate members likewise cooperating to support a second shaft whose axis is disposed above and forwardly of said first shaft, and a pair of plates integral with and extending forwardly from each of said collar members and arranged to receive a third shaft whose axis is ofiset relative to that of said first and second shafts and a series of line sheaves disposed on said shafts.

2. A shear pole head comprising a body arranged to bemounted on a pair of spaced shear poles and carrying a centrally located shaft, a series of spaced sheaves mounted on said shaft,

ding machines comprising a body having upper 10 and lower portions, collars arranged on the lower portion of said body to be mounted on a pair of shear poles, grooved bearing plates carried by said collars, a shaft journaled in bearings provided by said grooves, a series of casing sheaves on said shaft, a shaft mounted in the upper portion of said body above and forwardly of said first shaft, a sand line sheave mounted thereon, a shaft journaled in the lower portion of said body below and forwardly of said first shaft and a 20 drilling sheave mounted on said latter shaft.

WILLIAM H. EALY. 

